Improvement in combined look, and enob-latch



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E. G. F. ARNDT AND C. E. L. MOEBIUS, OF NEW YORK, N. Y. Letters PatentNo. 67,938, dated August 20, 1867.

IMPROVEMENT IN COMBINED LOCK, AND KNOB-LATCH.

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TO ALL WHOM IT MAY CONCERN:

Be it known that we, E. G. F. ARNDT and C. E. L. MOEBIUS, of the city,county, and-State of New York, have invented a new and usefulImprovement inLocks; and wevdo hereby declare that thc following is afull, clear, and exact description thereof, which will enable othersskilled in the art to make and use the same, reference being had to theaccompanying drawings, forming part of this specification, in which-Figure 1 is a. side view partly in section ot' our improved lock, theoutside covering-plate being removed.

Figure 2 is asimilar view of the lock, the parts being in differentposition.

Figure 3 is a. side view of the lock. i i

Figure 4 is a vertical cross-section of the same, the pla-ne of sectionbeing indicated by Ythe line :c fr, iig. 3.

Figure 5 is a side view of the key by which this lock maybe opened.

Figure 6 is a view of the night-key, by which the bolt can be4momentarily drawn in.

Similar letters of reference indicate corresponding parts.V i

This invention'reletes to certa-in improvements in the lock forwhich'Iietters Patent were granted to E. G. F. Arndt and A. Hiihne onthe eleventh day of November, 1862. The invention consists in soarranging a. spring-bolt lock that it may be used as a common bolt-lock,or as a night-lock, and which can be so locked from the inside by aguard-plate that the bolt cannot be moved by a key.

A represents the rectangular case of the lock, in which a isV the frontplate and b the back or inside plate, or that which will be on that sideof the door which is in the hall or room on which the lock'is applied. Cis the bolt, of which that part which is on the inside ofthe ease Aconsists of two arms, c and d, between which a groove or recess, c, isformed, through which the hub D passes. The latter is round where itfits through the plates a and b of the lock, butV that portion of itwhich is between these plates is square or polygonal, so that it cannotrevolve in the narrow end of the recess e,wbile in the widened portionof the same it can be freely turned. To one side of the boltr aresecured two pins,f and g, to which the vibrating tumblers E and F arerespectively pivoted. 'The form of the tumbler E is made similar to thatof the letter U, its one a'rm z being on the upper side of the hub D,together with the arm c of the bolt, while its other arm z'is near tothe lower extremity of the arm d of the bolt, and so as to ,be reachedby the key-bit. The tumbler F is a bent plate, as is shown (partly bydotted lines) in gs. 1 and 2. Its .one end is pivoted by a pin, j. tothe tumbler E, which pin is directly between and almost in line with thepins giandf, when the bolt is unlocked, and its other end is on theunderside of the hub D. The latter is thusenclosed between the arms edof the bolt, and also between the tumblcrs E and F. A spiral spring, G,which is secured to the arm z'of the tumbler E, tends to force thetumblers toward the hub, and a'iso to throw the bolt-out, while the sameis unlocked, and when itis drawn in by the action ot' the stem H or key.k are the studs on the hub D, and Z Z are studs secured to the edges ofthe tumblers, which enclose the hub. By turning the hub it operates thetumblers by means of these studs c and Z. When the bolt is unlocked, asin fig. 1, it can be operated by theshank or stem H, which passesthrough the hub. By turning the hub in either directionfone of the studs7c will operate one of the tumblers,l and as the latter is connectedwith the bolt by either the pin for g, the said bolt will be drawn intothe lock, but will at once be thrown out again by the spring G as soonas the handleI of the `stem is released. Thus far the bolt operates likea common spring or catch-lock. By applying the key J, which turns on apin, t, through a hole in the front plate a of the lock, its bitwillstrike and raise the arm z' of the tumbler E, and will thereby throwthe arm h of the same o' the hub, and as the two tumblers are connectedby the pin j the tumbler F will be also thrown ot the hub, so that whenthe bit of the key comes between two lugs, 'm m, which project from thearm d of the bolt C, the latter can be freely moved forward or locked,and will then carry the tumblers forward with it, as the lugs lrun clearof the lugs 7c on the hub. The bolt is guided bya pin, r, which issecured to the plate a of the case, and which passes through a slot, S,in the bolt, as is clearly shown in the drawing.` As soon as the bit ofthe key is disengaged from the bolt the tumblers will, by the action ofthespring Gr, be again thrown aganstthe hub, the lugs Z coming in frontof the lug 7c, (while formerly they were in rear of the same,) and thenall the parts will be in the position shown in fig. 2. Itv will be seenthat when the bolt is thus locked the hub is in the narrow part of therecess e and Acannot be turned, so that .the bolt,l when locked, cannotbe operated by the stem H, but only by the key J. To the tumbler F issecured a pin, K, which projects through the inside plate b of thelock-case, in which plate a slot, is providedfor the said pin to move induring the vmotion of the tumbler E. By m'eans of this pin the bolt .canbe unlocked from `the `inside of a room or hall without the use of thekey` By a guard plate, L, which is pivotetl or hinged to the plate b, asis`\clearly shown in iig. 3, the pin Kean be locked so that not evenAthe key from the outside can operate the bolt. Only one end of the stemH is made square, the main portion being rounded. When it is desired tothrow the stem out of gearwith the hub D it is onlyvnecessary to pull ittoward the inside of the hall or room and throw a guardplate, M, betweena shoulder, o, on the stem and the plate b of the lock-case. The roundportion of the stem will then only bein the hub, and `the stemicanbe-turned as much as desired without operating on the hub, and thesternl thus made useless the door can only be'opened by the use of tllekey J or by a night-key, N, the bit .of which only operates against theside of one'oi the lugs m on the bolt. By the use of this night-key thebolt can be operatedin asimilar manner as it is by the stem H. When thebolt is locked the night-key cannot be used, nor can Vtliestenn, even ifthe same is again thrown into gear with the hub. Only the key Jeanunlock the bolt again. Between thelugs m mandvthe arm of the tumbler Eis interposed a thin plate, p, secured to the bolt, whiehiitsiintosagfn'otoli'inthe keyv J,and prevents feeling of the lock. Aspiral spring, O, is arranged around the'steml-'H between. theplate aandasbouller on the'said stem, which will throw the square end of thestem into thebubagam'fas seen as the guard-plate M is disengaged -fromthe stein. The lock can thus be used for a great many'n-p rpozsesVByleavingfoithe andslot n'the'lock can be made so as to be only operatedby the keys ands un v, n ,l i

Having thus deseribed myA invention, llclaifnras''new, and desire tosecure by Letters Patent- 1. The square o I v lygo'nalbubD,wheniarrangedbetween the arms c and. d of the bolt in the recess e",which is narrow at t e end,- Jsubstantially as and fori-the purposeherein shown and described. v

2. The stem H, wheninade'p'artly square'C-'or polygonal) 4and partlyround, in combination with the guard plate M and spring O,allin'ade'andvoperatingsubstantially as and for the purpose herein shownand described.

3. The vibrating tumblers E and F, when ,lpivot'e'd 'togetherandarranged substantially as herein shown and desribed, in combinationwith the bolt 0,'spring square or polygonal hub D, all made andoperating substantially as heroin shown and described. Y

4. '.lhe guard-plates L and M, in combinations-ith each other and withthe stem H and pin K, all made and operating substantially as andfor thepurposeherein shown and described.

5. A spring-bolt lock, which is so constructed vthat it can be operatedby a. stem, H, and key, J, or by the latter and a night-key, N, or byall three, for by the key J only, substantially as and for the purposeherein shown and described.

E. G. F. ARNDT, C. E. L. MOEBIUS.

Witnesses:

WM. F. McNAMARA, ALEX. F. ROBERTS.

